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A3977 Datasheet(PDF) 13 Page - Allegro MicroSystems |
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A3977 Datasheet(HTML) 13 Page - Allegro MicroSystems |
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13 / 18 page  Microstepping DMOS Driver with Translator A3977 13 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Half-Step Operation MS1 = H, MS2 = L, DIR = H The mixed-decay mode is controlled by the percent fast decay voltage (VPFD). If the voltage at the PFD input is greater than 0.6VDD then slow-decay mode is selected. If the voltage on the PFD input is less than 0.21VDD then fast-decay mode is selected. Mixed decay is between these two levels. |
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